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BARIUM OXIDE
ICSC: 0778
Peer-Review Status: 20.10.1999 Validated
Barium monoxide
Barium protoxide
Calcined baryta 
CAS #: 1304-28-5 RTECS #: CQ9800000
UN #: 1884
EC #: 056-002-00-7
EINECS #: 215-127-9
 		    Formula: BaO
Molecular mass: 153.3

TYPES OF
HAZARD /
EXPOSURE 		ACUTE HAZARDS / SYMPTOMS      PREVENTION      FIRST AID / FIRE FIGHTING
FIRE Not combustible.    In case of fire in the surroundings, use appropriate extinguishing media. 
EXPLOSION      
 
EXPOSURE   PREVENT DISPERSION OF DUST! STRICT HYGIENE!   
Inhalation Cough. Sore throat.  Use local exhaust or breathing protection.  Fresh air, rest. Refer for medical attention. 
Skin Redness. Pain.  Protective gloves.  Remove contaminated clothes. Rinse skin with plenty of water or shower. Refer for medical attention . 
Eyes Redness. Pain.  Wear safety spectacles or eye protection in combination with breathing protection if powder.  First rinse with plenty of water for several minutes (remove contact lenses if easily possible), then refer for medical attention. 
Ingestion Abdominal pain. Diarrhoea. Nausea. Vomiting. Muscle paralysis. Irregular heartbeat. Elevated blood pressure.  Do not eat, drink, or smoke during work.  Rinse mouth. Induce vomiting (ONLY IN CONSCIOUS PERSONS!). Give one or two glasses of water to drink. Refer for medical attention . 

SPILLAGE DISPOSAL
 		PACKAGING & LABELLING
Sweep spilled substance into covered containers. Carefully collect remainder. Then store and dispose of according to local regulations. Do NOT let this chemical enter the environment. Personal protection: particulate filter respirator adapted to the airborne concentration of the substance.  Airtight.
Do not transport with food and feedstuffs. 
EC Classification
Symbol: Xn; R: 20/22; S: (2)-28; Note: A 
UN Classification
UN Hazard Class: 6.1; UN Pack Group: III 
GHS Classification
 

EMERGENCY RESPONSE SAFE STORAGE
Transport Emergency Card: TEC (R)-61GT5-III.  Separated from food and feedstuffs. Dry. Well closed. 

IMPORTANT DATA
Physical State; Appearance
YELLOWISH-WHITE SOLID IN VARIOUS FORMS. 

Physical dangers
 

Chemical dangers
The solution in water is a medium strong base. Reacts violently with water, dinitrogen tetraoxide, hydroxylamine, sulfur trioxide and hydrogen sulfide. This generates fire and explosion hazard. 

Occupational exposure limits
TLV (as Ba): 0.5mg/m³ as TWA; A4 (not classifiable as a human carcinogen); (ACGIH 2004).
MAK (as Ba, inhalable fraction): 0.5 mg/m³; Peak limitation category: II(8); Pregnancy risk group: D; BAR issued; (DFG 2009). 

Routes of exposure
The substance can be absorbed into the body by inhalation of its aerosol and by ingestion. 

Inhalation risk
Evaporation at 20°C is negligible; a harmful concentration of airborne particles can, however, be reached quickly when dispersed. 

Effects of short-term exposure
The substance is irritating to the eyes, skin and respiratory tract. The substance may cause effects on the nervous system. Exposure could cause hypokalaemia. This may result in cardiac disorders and muscular disorders. Exposure could cause death. 

Effects of long-term or repeated exposure
 


PHYSICAL PROPERTIES ENVIRONMENTAL DATA
Boiling point: ~2000°C
Melting point: 1923°C
Density: 5.7 g/cm³
Solubility in water, g/100ml at 20°C: 3.8   		The substance is harmful to aquatic organisms. 

NOTES
Reacts violently with fire extinguishing agents such as water.
Specific treatment is necessary in case of poisoning with this substance; the appropriate means with instructions must be available.
NEVER pour water into this substance; when dissolving or diluting always add it slowly to the water.
Card has been partly updated in April 2005.
See sections Occupational Exposure Limits, Emergency Response. 

ADDITIONAL INFORMATION
 

IPCS
International
Programme on
Chemical Safety 		WHO ILO EC Prepared in the context of cooperation between the International Programme on Chemical Safety and the European Commission
© IPCS 2004-2012
LEGAL NOTICE Neither the EC nor the IPCS nor any person acting on behalf of the EC or the IPCS is responsible for the use which might be made of this information. 
    See Also:
       Toxicological Abbreviations